Keta Taylor, center, of Birmingham, Ala., joins other demonstrators during a rally and march in support of Trayvon Martin in Birmingham, Ala., on Monday.

WASHINGTON — Attorney General Eric Holder said Monday the killing of Trayvon Martin was a “tragic, unnecessary shooting” and that the 17-year-old's death provides an opportunity for the nation to speak honestly about complicated and emotionally charged issues.

In his first comments since the acquittal of George Zimmerman in the Martin case, the attorney general said that Martin's parents have suffered a pain that no parent should have to endure. He said the nation must not forgo an opportunity toward better understanding of one another.

On Sunday, the Justice Department said it is reviewing evidence in the case to determine whether criminal civil rights charges are warranted.

The Justice Department opened an investigation into Martin's death last year but stepped aside to allow the state prosecution to proceed.

Holder said, “We are ... mindful of the pain felt by our nation surrounding the tragic, unnecessary shooting death of Trayvon Martin in Sanford, Fla., last year.”

“I want to assure you that the Justice Department will continue to act in a manner that is consistent with the facts and the law,” said Holder.

“Independent of the legal determination that will be made, I believe that this tragedy provides yet another opportunity for our nation to speak honestly about the complicated and emotionally charged issues that this case has raised,” Holder said in remarks to the 51st national convention of the Delta Sigma Theta sorority.

“We must not — as we have too often in the past — let this opportunity pass,” he said.

The Justice Department says the criminal section of the Justice Department's civil rights division, the FBI and federal prosecutors in Florida are continuing to evaluate the evidence generated during the federal investigation, plus evidence and testimony from the state trial.

The NAACP and others are calling on the Justice Department to open a civil rights case against Zimmerman. Thousands of demonstrators from across the country protested the jury's decision to clear Zimmerman in the shooting death of the unarmed black teenager.

Also on Monday, the White House says President Barack Obama won't involve himself in the Justice Department decision on whether to pursue civil rights charges against Zimmerman. White House spokesman Jay Carney said it would be inappropriate for Obama to express an opinion on how the department deals with Zimmerman.